* Create a calibration curve for the determination of Ag<sup>+</sup> with a silver ion-selective electrode. Solutions of AgNO<sub>3</sub> and KNO<sub>3</sub> made on [[User:Melissa_Novy/Notebook/CHEM-572/2013/02/05|2013/02/05]] were used.

* Create a calibration curve for the determination of Ag<sup>+</sup> with a silver ion-selective electrode. Solutions of AgNO<sub>3</sub> and KNO<sub>3</sub> made on [[User:Melissa_Novy/Notebook/CHEM-572/2013/02/05|2013/02/05]] were used.

* Test [[User:Melissa_Novy/Notebook/CHEM-572/2013/01/30|reserved filtrate solution]] from 95Ag-LMT (24 h). Please refer to the entry on [[User:Melissa_Novy/Notebook/CHEM-572/2013/02/13|2013/02/13]] for the data.

* Test [[User:Melissa_Novy/Notebook/CHEM-572/2013/01/30|reserved filtrate solution]] from 95Ag-LMT (24 h). Please refer to the entry on [[User:Melissa_Novy/Notebook/CHEM-572/2013/02/13|2013/02/13]] for the data.

DH5α-T1 Cells

100Ag-LMT

Observations

During the week that the solution was stirring, the Laponite formed a thick, medium gray gel with the consistency of Neosporin. Half of the gel was reserved for further testing, and the other half was resuspended in (50:50) H2O/EtOH and filtered with 42 Whatman paper. The sample was covered with aluminum foil at all times to prevent photodamage to the silver.

The sample was left to filter overnight. The next day, 100Ag-LMT was brown in color and was still damp. However, its texture changed to a Jello-like consistency. It was scraped from the filter paper and placed in an aluminum dish in an 80°C oven to dry. The filtrate was reserved for further testing.

Ag+ Calibration Curve

Protocol

Beginning with the lowest concentration solution first, place 5 mL in a clean, dry small glass test tube.

Add 100 μL of 5 M KNO3 as an ionic strength adjustor.

Stir the solution well, then place the electrode in the solution and measure the mV.

Repeat the measurement twice more.

Remove the electrode, rinse it well with deionized water, and blot it dry with Kimwipes.

Repeat steps 1-5 for all solutions

Notes

The calibration solutions were at the following concentrations of Ag+: 0.0001 M, 0.0010 M, and 0.0105 M. The electrode was stored in 0.0105 M AgNO3 until next needed.